By the great silver-tongued orator himself. Do not dismiss Bryan because of his opposition to evolutionary theory. He was a great progressive who had problems with evolution mainly because it was even then being used to justify a "survival of the fittest" social policy which he believed was gravely immoral (as do I).
"There are two ideas of government. There are those who believe that if you just legislate to make the well-to-do prosperous, that their prosperity will leak through on those below. The Democratic idea has been that if you legislate to make the masses prosperous their prosperity will find its way up and through every class that rests upon it."
-- William Jennings Bryan